I'm considering buying a treadmill. I hate treadmills. But the wife wants one so the smart money says we'll end up with one.

I need to query the CP brain trust regarding the treadmill products out there.

I'm looking for one that I (she) can move pretty easily. Don't want it to cost a fortune but I also don't want to end up with a pile of **** either. I may use it from time to time, and I'm enormous, so how big of a deck should I get?

Go to an actual exercise equipment store. There is a big difference between health club quality equipment and those little flimsy things you see at academy/dicks/etc. You'll probably need to spend $1000 minimum.